Your description makes me think you have a Mighty Mouse, not a Magic Mouse. If true, then the Mighty Mouse is notorious for a ball that won't scroll. Grab a paper towel, turn the mouse upside down on your lap, and run the mouse back and forth several times against the paper towel to help soak up oils from your fingers that are on the ball. It should start working then, albeit for a short time before it starts it again.

I'm not sure how the Magic Mouse works exactly, but I would imagine that the device would be shown in the Bluetooth Preferences. I would delete the Magic Mouse from the list, then go into Mouse settings and try setting it up again.

I have a magic mouse, but I know what you are talking about. I reinstalled usb overdrive, but it still dosn't scroll. Is there a way to reinstall the mouse drivers?

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I have the same problem. I installed the magic mouse today and it will left and right click, but no scrolling at all! The window that opens when clicking the mouse under system preferences is the old one which does not show the updated wireless magic mouse options. Anyone else with ideas?

this happened to me and i went to apple and they replaced it. then my replacement did the same thing. 3rd time was a charm for me, and i didn't buy the mouse it came with the computer, so go ask them and they will probably replace it.

This is what you have to do:
1) Install USB OVERDRIVE (again)
2) Go to de folder APLICATTIONS OR UTILLITIES (I DONT REMEMBER) and in one of these 2 folders you will find one with de description UNINSTALL USB OVERDRIVE.
3) Do it and after that put the files MAGICPREFS to the garbage can.
4) Initialize your mac.
5) Install MAGICPREFS again.
6) Thats it.. it will solve your problem.

If you have ever installed usb overdrive and deleted it by selecting delete from preferences panel, you need to reinstall usb overdrive and find it in applications and select uninstall usb overdrive.
works every time.
cheers

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